Bodum
Thermal Glassware Details Page

I enjoyed these new hand-blown, double-wall insulated glass
cups for 4 weeks until I finally broke one. It was inevitable. In slow-motion,
I watched the demitasse Assam cup roll off the table, drop 2 feet onto
a wood board without breaking, then drop aother foot onto the concrete
floor. That was that. When glass meets concrete, you know who wins. But
I was surprised to see how it bounced off the wood surface without breaking
and realized it is because the cups are lab glass (Borosilicate).

*Note: 9 ounce size (middle cup shown above) no longer stocked

More about the glass used in the double-walled
cups from Bodum: Bodum's insulated glassware is made from durable
Borosilicate glass. Borosilicate glass is a strong heat-resistant glass
that weighs less than traditional glassware. Used to make scientific
lab glass, borosilicate glass (medical grade glass) is stronger than
traditional "soda-lime" glass
and can be used for everything from drinkware to cookware. Borosilicate
glass substitutes boron oxide in place of the soda and lime used in traditional
glassware. The boron oxide acts as a glue holding the silicate together
and due to the small size of boron particles, the glass is held together
tighter, resulting in a stronger glass. Some customers may perceive the
glass to be "thin" as they hold it. It is important to explain
the difference between borosilicate and soda lime glass. Borosilicate
glass doesn't need to be as thick as traditional glass to be just as
strong. Borosilicate is simply a different type of glass that is resistant
to temperature swings and scratching. Because the particles are held
together so tightly, borosilicate glass is dishwasher safe and will not
become cloudy over time; you can rest assured that after 100 cycles,
the glass will be as clear as the day you bought it. Simply treat it
as you would any glass product and it will stand up to every day use.
Dishwasher & microwave safe. Instructions for use: Bodum
insulated, double wall glass is handmade by expert artisans, so they
say. Because this glass is mouth-blown (their term, not mine!), each
one may have slight differences in height, thickness & weight. Please
use care when placing ice into the glass to avoid fracturing the inner
layer. Please also avoid using metal spoons or placing the glass into
a crowded dishwasher. These glasses will help to keep hot drinks warmer
and cool drinks cooler. For best results retaining heat, pre-heat the
glass before use. Dishwasher & microwave
safe.